android - 如何在长按列表项时显示按钮

Question

我需要在长按列表项时显示删除按钮..

我有长按的代码..但不知道如何编写代码以在此长按内显示按钮...

Answer 1

终于得到答案了...

.xml 文件

<ImageButton
        android:id="@+id/imgdelete"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/delete" 
        android:visibility="invisible"/>

.java 文件

      lv.setOnItemLongClickListener(new OnItemLongClickListener() {

        @Override
        public boolean onItemLongClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {

            arg1.findViewById(R.id.imgdelete).setVisibility(View.VISIBLE);
            return false;
        }
    });
}

Answer 2

首先，您必须使用代码使删除按钮不可见，或者在 xml 文件中设置它的属性。当用户单击时，longpress您必须使该删除按钮可见。删除操作完成后，再次使该按钮不可见。

Answer 3

您可以使用警报对话框。这是一个例子

listView.setOnItemLongClickListener(new OnItemLongClickListener() {

            public boolean onItemLongClick(AdapterView<?> parent, View view,
                    int position, long id) {
                final CharSequence[] items = { "Delete Item" };


                AlertDialog.Builder builder = new AlertDialog.Builder(
                        [CLASS_NAME].this);
                builder.setTitle("Delete Item");
                builder.setItems(items, new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int item) {
                        Intent i;
                        switch (item) {
                        case 0:
                            AlertDialog.Builder builder = new AlertDialog.Builder(
                                    SelectProfile.this);
                            builder.setMessage(
                                    "Are you sure you want to delete?")
                                    .setCancelable(false)
                                    // Prevents user to use "back button"
                                    .setPositiveButton(
                                            "Delete",
                                            new DialogInterface.OnClickListener() {
                                                public void onClick(
                                                        DialogInterface dialog,
                                                        int id) {
                                                    //Todo code here
                                                }
                                            })
                                    .setNegativeButton(
                                            "Cancel",
                                            new DialogInterface.OnClickListener() {
                                                public void onClick(
                                                        DialogInterface dialog,
                                                        int id) {
                                                    dialog.cancel();
                                                }
                                            });
                            builder.show();
                            break;
                        }
                    }
                });
                AlertDialog alert = builder.create();
                alert.show();
                return false;
            }
        });